// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//


#include <pollux/common/base/random_util.h>

namespace kumo::pollux::random {
    namespace {
        std::optional<uint32_t> customSeed;
    }

    void setSeed(uint32_t value) {
        customSeed = value;
    }

    uint32_t getSeed() {
        return customSeed ? *customSeed : melon::Random::rand32();
    }

    RandomSkipTracker::RandomSkipTracker(double sampleRate)
        : sampleRate_(sampleRate) {
        POLLUX_CHECK(0 <= sampleRate && sampleRate < 1);
        if (sampleRate > 0) {
            dist_ = std::geometric_distribution<uint64_t>(sampleRate);
            rng_.seed(getSeed());
        }
    }
} // namespace kumo::pollux::random
